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| | PlanetMath: regular open set |
 | | It is not true, however, that the union of two regular open sets is regular open, as illustrated by the second example above. |
 | | Cross-references: closed set, intersection, operations, Boolean algebra, union, property, dense, open set, structure, open intervals, generated by, line, real, closure, interior, open, subset, topological space |
 | | This is version 2 of regular open set, born on 2005-02-20, modified 2005-02-22. |
| planetmath.org /encyclopedia/RegularClosed.html (207 words) |
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